Composite design pattern

core-java/src/main/java/com/baeldung/designpatterns/composite/CompositeDemo.java

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+package com.baeldung.designpatterns.composite;
+
+/**
+ * Created by Gebruiker on 5/3/2018.
+ */
+public class CompositeDemo {
+
+    public static void main(String args[]) {
+        Department salesDepartment = new SalesDepartment();
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/composite/Department.java

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+package com.baeldung.designpatterns.composite;
+
+/**
+ * Created by Gebruiker on 5/1/2018.
+ */
+public interface Department {
+
+    void printDepartmentName();
+}

core-java/src/main/java/com/baeldung/designpatterns/composite/FinancialDepartment.java

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+package com.baeldung.designpatterns.composite;
+
+/**
+ * Created by Gebruiker on 5/1/2018.
+ */
+public class FinancialDepartment implements Department {
+
+    private Integer id;
+    private String name;
+
+    public FinancialDepartment(Integer id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public void printDepartmentName() {
+        System.out.println(getClass().getSimpleName());
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/composite/GeneralDepartment.java

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+package com.baeldung.designpatterns.composite;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by Gebruiker on 5/1/2018.
+ */
+public class GeneralDepartment implements Department {
+
+    private Integer id;
+    private String name;
+
+    private List<Department> childDepartments;
+
+    public GeneralDepartment(Integer id, String name) {
+        this.id = id;
+        this.name = name;
+        this.childDepartments = new ArrayList<Department>();
+    }
+
+    public void printDepartmentName() {
+        childDepartments.stream().forEach(Department::printDepartmentName);
+    }
+
+    public void addDepartMent(Department department) {
+        childDepartments.add(department);
+    }
+
+    public void removeDepartment(Department department) {
+        childDepartments.remove(department);
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/composite/SalesDepartment.java

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+package com.baeldung.designpatterns.composite;
+
+/**
+ * Created by Gebruiker on 5/1/2018.
+ */
+public class SalesDepartment implements Department {
+
+    private Integer id;
+    private String name;
+
+    public SalesDepartment(Integer id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public void printDepartmentName() {
+        System.out.println(getClass().getSimpleName());
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}